Verruckt32 Posted March 27, 2015 Share Posted March 27, 2015 I recently bought a '73 240Z with an L28 and 5 speed swap. The transmission operates perfectly, but it makes a "whirring" sound when moving and when the clutch is out. When the clutch is depressed, the noise stops. From what I read, it seems it has a bad input shaft bearing. Also, I was going through and changing all of the fluids and found what I would call "significant" shavings and a few large chunks on the magnetic drain plug. The large chunks look to be pieces of bearing race. Can anyone smarter than myself on transmissions confirm this diagnosis? Also, being that the transmission works well, how long can I expect to drive it before something bad happens? When something bad happens, is it going to make things worse and totally grenade creating more carnage? Any insight would be helpful. Thanks! Quote Link to comment Share on other sites More sharing options...
NewZed Posted March 27, 2015 Share Posted March 27, 2015 The whirring noise that goes away when you press the clutch is normal. But the metal fragments are not. Those pieces look like bearing retainer, not race, so the balls may still be wear they're supposed to be. I've only seen one failed bearing and it was in the adapter plate. Regardless, you might be able to save the transmission by replacing the bearing before it fails completely. It may not grenade but the misalignment will cause damage. Quote Link to comment Share on other sites More sharing options...
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